665602145 has 8 divisors (see below), whose sum is σ = 860162856. Its totient is φ = 491521536.

The previous prime is 665602141. The next prime is 665602151. The reversal of 665602145 is 541206566.

It can be written as a sum of positive squares in 4 ways, for example, as 839056 + 664763089 = 916^2 + 25783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665602145 - 2² = 665602141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665602141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5119952 + ... + 5120081.

It is an arithmetic number, because the mean of its divisors is an integer number (107520357).

Almost surely, 2^665602145 is an apocalyptic number.

665602145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

665602145 is a deficient number, since it is larger than the sum of its proper divisors (194560711).

665602145 is a wasteful number, since it uses less digits than its factorization.

665602145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10240051.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 665602145 is about 25799.2663655384. The cubic root of 665602145 is about 873.1152443636.

The spelling of 665602145 in words is "six hundred sixty-five million, six hundred two thousand, one hundred forty-five".